Reset the CHANGELOG.md after

1 - creation of tag v2.1.0 on master
2 - creation of the branche release-v2.1.0 upon this tag v2.1.0

CHANGELOG.md

@@ -3,45 +3,19 @@
 Release changelog are available here :
 https://gitlab.inria.fr/croco-ocean/croco_tools/-/releases
 
-## [2.1.0] - 2025-03-21
+## [x.x.x] - xxxx-xx-xx
 
 ### Added
 
-- Update croco_frcbio.nc creation with make_dust.m and make_ndepo.m (Issue #57)
-- Add standard time unit, cycle_length and calendar attribute name
-  into input files (Issue #51)
-- Add GSHHS coastline dataset in m_map private directory (Issue #49, Issue #43)
 
 ### Fixed
 
-- Fix overlaps problems with mercator daily and monthly forcing
-  starting the first days of the month at 00:00h (Issue #60)
-- Fix for biogeochemistry into nestgui
-    (interp_ini,interp_frcbio, interp_clim) (Issue #59)
-- Fix propagation of time unit, cycle_length and calendar attribute updates (#51)
-- Fix and clean indent in croco_tools (Issue #51)
-- Fix in mexcdf functionality for matlab 20xx versions (in
-  particular matlab 2024) (Issue #50)
-- Fix problem in editmask with longitude in 0-360° convention (Issue #44, Issue #28)
-- Fix redef and endef issue in Nesting tools + some cleaning in
-  nestgui (Issue #34)
-- Fix make_ERA5 with add_tides and add_waves (Issue #55)
-- Fix copernicus marine toolbox python environnement (Issue #38)
-- Fix datasets names used with copernicus marine toolbox for the 
-  MERCATOR glorys reanalysis (Issue #26)
-- Fix ERA5 format changes (Issue #32)
-
 
 ### Changed
 
-- Move npzd and bioebus scripts into a dedicated directory :
-  Preprocessing/Bio/npzd-bioebus (Issue #58)
-- Change datasets used for npzd-bioebus inputs file (Issue #58)
 
 ### Removed
 
-- Remove creation of croco_ini.nc using make_clim.m to avoid
-  confusion (also in Preprocessing/Bio) (Issue #58)
 
 ### Deprecated
 
@@ -54,8 +28,7 @@ https://gitlab.inria.fr/croco-ocean/croco_tools/-/releases
 ### Contributors on this release
 
 - Contributors already on board :  
-  Gildas Cambon, Christian Ethé, Swen Jullien, Solène Le Gac, Patrick
-  Marchesiello, Camille Mazoyer, Guillaume Morvan, Renaud Person
+
 
 - New contributors :  
-  Aline Zribi
+